Cortical Reorganization of Peripheral Vision Induced by Simulated Central Vision Loss

Area of Science:

• Neuroscience
• Vision Science
• Cognitive Science

Background:

• The brain compensates for central vision loss by utilizing peripheral retina for fixation.
• Neural mechanisms of this compensatory adjustment are not fully understood.

Purpose of the Study:

• Investigate cortical reorganization following simulated central vision loss.
• Examine how oculomotor training impacts visual crowding and sensory coding.

Main Methods:

• Human subjects trained to track objects using eccentric retinal loci.
• Psychophysics and functional magnetic resonance imaging (fMRI) measured visual crowding before and after training.

Main Results:

• Training induced an axis-specific reduction in visual crowding.
• Reduced crowding correlated with decreased cortical suppression in visual areas, starting in V1.
• BOLD signal changes reflected the adaptation in sensory coding.

Conclusions:

• The adult visual system can reorganize oculomotor control and sensory coding to adapt to vision loss.
• Oculomotor training facilitates form processing in peripheral vision by reducing crowding.
• Cortical plasticity allows the brain to reshape peripheral vision in response to central vision deficits.